这个奖项是如此荣幸和出乎意料——我（感到）说不出话来。

This prize is such an honor and so unexpected - I ___am ___lost ___for ___words.

我如此愤怒，以至于我（感到）很长时间说不出话来。

I was so enraged that I ___was ___lost ___for ___words for quite a long time.

当她看到惊喜派对时，她（感到）说不出话来。

When she saw the surprise party, she ___was ___lost ___for ___words.